Mercurial > dive4elements > river

comparison flys-artifacts/src/main/java/org/dive4elements/river/exports/LegendProcessor.java @ 5831:bd047b71ab37

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Repaired internal references
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 12:06:39 +0200
parents flys-artifacts/src/main/java/de/intevation/flys/exports/LegendProcessor.java@3dc26ec2558d
children
comparison
equal deleted inserted replaced
5830:160f53ee0870 5831:bd047b71ab37
1 package org.dive4elements.river.exports;
2
3 import java.awt.geom.Line2D;
4 import java.util.ArrayList;
5 import java.util.HashMap;
6 import java.util.Iterator;
7 import java.util.LinkedHashMap;
8 import java.util.List;
9
10 import org.jfree.chart.LegendItem;
11 import org.jfree.chart.LegendItemCollection;
12 import org.jfree.chart.plot.XYPlot;
13
14
15 /** Class to process Plots legends. */
16 public abstract class LegendProcessor {
17
18 /** (Empty) shape for aggregated Legend Items. */
19 private static final Line2D.Double SPACE = new Line2D.Double(0,0,0,0);
20
21
22 /** Prevent instantiations. */
23 private LegendProcessor() {
24 }
25
26
27 /**
28 * Create a hash from a legenditem.
29 * This hash can then be used to merge legend items labels.
30 * @return hash for given legenditem to identify mergeables.
31 */
32 protected static String legendItemHash(LegendItem li) {
33 // TODO Do proper implementation. Ensure that only mergable sets are created.
34 // getFillPaint()
35 // getFillPaintTransformer()
36 // getLabel()
37 // getLine()
38 // getLinePaint()
39 // getLineStroke()
40 // getOutminePaint()
41 // getOutlineStroke()
42 // Shape getShape()
43 // String getToolTipText()
44 // String getURLText()
45 // boolean isLineVisible()
46 // boolean isShapeFilled()
47 // boolean isShapeOutlineVisible()
48 // boolean isShapeVisible()
49 String hash = li.getLinePaint().toString();
50 // XXX: DEAD CODE // String label = li.getLabel();
51 /*if (label.startsWith("W (") || label.startsWith("W(")) {
52 hash += "-W-";
53 }
54 else if (label.startsWith("Q(") || label.startsWith("Q (")) {
55 hash += "-Q-";
56 }*/
57
58 // WQ.java holds example of using regex Matcher/Pattern.
59
60 return hash;
61 }
62
63
64 /**
65 * Create new legend entries, dependent on settings.
66 * @param plot The plot for which to modify the legend.
67 * @param threshold How many items are needed for aggregation to
68 * be triggered?
69 */
70 public static void aggregateLegendEntries(XYPlot plot, int threshold) {
71 LegendItemCollection old = plot.getLegendItems();
72 // Find "similar" entries if aggregation is enabled.
73
74 int maxListSize = 0;
75 int AGGR_THRESHOLD = threshold;
76
77 if (AGGR_THRESHOLD > old.getItemCount() || AGGR_THRESHOLD <= 0){
78 return;
79 }
80
81 HashMap<String, List<LegendItem>> entries = new LinkedHashMap<String, List<LegendItem>>();
82 for (Iterator<LegendItem> i = old.iterator(); i.hasNext();) {
83 LegendItem item = i.next();
84 String hash = legendItemHash(item);
85 List<LegendItem> itemList = entries.get(hash);
86 if (itemList == null) {
87 itemList = new ArrayList<LegendItem>();
88 entries.put(hash, itemList);
89 }
90 itemList.add(item);
91
92 if (itemList.size() > maxListSize) {
93 maxListSize = itemList.size();
94 }
95 }
96
97 if (maxListSize < AGGR_THRESHOLD) {
98 // No need to do anything.
99 return;
100 }
101
102 // Run over collected entries, merge their names and create new
103 // entry if needed.
104 LegendItemCollection newLegend = new LegendItemCollection();
105 for (List<LegendItem> itemList: entries.values()) {
106 if (itemList.size() >= AGGR_THRESHOLD) {
107 // Now do merging.
108 // XXX: DEAD CODE // LegendItem item = itemList.get(0);
109 // Unfortunately we cannot clone and just setDescription, as this
110 // method was added in JFreeChart 1.0.14 (we are at .13).
111
112 // Remove the shapes of all but the first items,
113 // to prevent "overfill" of legenditemblock.
114 for (int i = 0; i < itemList.size(); i++) {
115 if (i != 0) {
116 LegendItem litem = itemList.get(i);
117
118 // Make shape and line really small.
119 LegendItem merged = new LegendItem(
120 "," + litem.getLabel(), litem.getDescription(), litem.getToolTipText(),
121 litem.getURLText(), false, SPACE,
122 false, litem.getFillPaint(), false,
123 litem.getOutlinePaint(), litem.getOutlineStroke(), false,
124 SPACE, litem.getLineStroke(), litem.getLinePaint());
125 newLegend.add(merged);
126 }
127 else {
128 newLegend.add(itemList.get(i));
129 }
130 }
131 }
132 else {
133 // Do not merge entries.
134 for (LegendItem li: itemList) {
135 newLegend.add(li);
136 }
137 }
138 }
139
140 plot.setFixedLegendItems (newLegend);
141 }
142 }
143 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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